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Related to trisomy 13: Trisomy 18, Trisomy 8


(cell and molecular biology)
The presence in triplicate of one of the chromosomes of the complement.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the presence of one or a few nonhomologous extra chromosomes in the chromosome set of a diploid organism. Organisms (or cells) in which one, two, or more chromosomes present themselves as three homologues are called simple trisomics, double trisomics, and so forth. Trisomy is caused by the failure of chromosomes to separate (nondisjunction) during cell division. Some specific severe disorders are the result of trisomy occurring in specific chromosomes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
In theory, the chromosomal complement that can form a carrier in the gametes are three viable: one normal, another balanced, trisomy 13, and three unbalanced gametes that are incompatible with life beyond the first trimester of pregnancy.
DNA sequencing of maternal plasma reliably identifies trisomy 18 and trisomy 13 as well as down syndrome: an international collaborative study.
Indications for prenatal diagnostic testing were: maternal age, abnormal results of aneuploidy screening (combined first-trimester or biochemical second-trimester screening for DS >1/300 or 1:150 for trisomy 13 or 18), abnormal structural findings in fetal ultrasound (including increased nuchal translucency [greater than or equal to]3.5 mm before the introduction of the first-trimester screening, major fetal abnormality, and soft ultrasound markers), parental translocation carrier status, parental carrier status of a known genetic disorder, previous child with aneuploidy or other genetic disorder, and maternal request.
Ann and Frank are actively involved with S.O.F.T., a nationwide family support group for Trisomy 13, Trisomy 18, and related disorders.
Trisomy 13.--Thirteen pregnancies were terminated after a fetal diagnosis of Patau syndrome.
These anomalies include limb abnormalities, epidermal nevi, epidermolysis bullosa, chromosomal abnormalities such as trisomy 13, ectodermal dysplasias, or other malformation syndromes, including Adams-Oliver syndrome.
There is abundant evidence to support the efficacy of NIPT, using cfDNA, in screening for trisomies 21 and 18, and to a lesser extent trisomy 13. [5] High efficacy has also been reported by test manufacturers for monosomy X, sex chromosome trisomies and, for some tests, triploidy.
Aziz's report of bilateral axillary arch muscle in a case of trisomy 13 and aneuploidy (trisomy 18), the variant AAM, was found along with other supernumerary muscles, a regular feature found in monkeys and great apes.
Cataracts are also evident in syndromes with systemic deformities comprising Trisomy 21, Turner's syndrome, Trisomy 13, Lowes Syndrome, Nance Horan syndrome Marnesco Sjogren syndrome, etc.
The educator simply sits down at the table and looks down at the coffee cup lid and says, "So what's in the best interest of this student who is nonverbal, seizure prone, oxygen dependent, tube fed, non- ambulatory, trisomy 13, coupled with a severe combined immunodeficiency and has otospondylomegaepiphyseal dysplasia."
Sensitivities for trisomy 13 and sex chromosomal abnormalities are somewhat lower, but the specificity is greater than 99% for each condition, meaning that false-positive rates are very low.
Both the CARE and NEXT trials also evaluated cfDNA testing vs standard screening for diagnosis of trisomy 13 and 18 and found higher PPVs and lower false positive rates for cfDNA compared with traditional screening.